Ok, my pin control is working. The PC side of this is an MLP program which has two radio buttons and a text box. The function of the radio buttons is to send commands to the Arduino Uno and the Uno interprets these and sets or clears pin 13. Then the Arduino notifies the MLP text box of the current state of pin 13. I. not sure how to share this but I'd be very happy to share. I still have three days on my free trial.

Hi Griiker, here is an example that should demonstrate the radio buttons. The .ino file is the arduino program which you need to open and program to your device. The .mlpz files is a premade megunolink interface with radio buttons.